尚家地区葡萄花油层沉积微相特征及其控油规律

尚家地区储层分布严重制约了该区岩性油藏的精细开发。以岩心和测井分析资料为基础,通过对尚家地区葡萄花油层的岩石学特征、沉积构造、粒度分布等相标志的综合研究,确定该区为河控三角洲相沉积,并进一步细分为水上分流河道、决口河道、溢岸砂、水下分流河道、分流间湾、席状砂六种沉积微相。结合区域地质背景,利用模式预测法对该区葡萄花油层沉积微相进行刻画,掌握了沉积微相的时空展布和变化规律。同时,探讨沉积微相对油气的控制作用,分流河道为该区含油性最好的储层,从而为该区岩性油藏的进一步高效开发提供了技术支持。

Sedimentary microfacies characteristics and its controlling rule on oil distribution of Putaohua oil reservoir in Shangjia area

Reservoir distribution of Shangjia area seriously restricted the fine development of lithologic reservoir. Based on core and logging data, and by comprehensive study on the facies characteristic like facies characteristic, sedimentary structure and parti-cle size distribution, Putaohua oil reservoir in Shangjia area was determined to be fluvial dominated delta deposit and further subdi-vided into six sedimentary microfacies, that is overwater distributary channel, crevasse channel, over-bank sand, underwater dis-tributary channel, inter-distributary bay and sheet sand. Combined with the regional geological background, mode prediction meth-od was used to depict the sedimentary microfacies of this area of Putaohua oil reservoir to know well about the time-space distribu-tion and variation. Meanwhile, the controlling action of sedimentary microfacies to the oil and gas was discussed to draw the conclu-sion that the distributary channel was the best oil-bearing reservoir of this area. The researches provided technical support for the further efficient development of the lithologic deposit in this area.